31

AT89LS52

2601A–12/01

AC Characteristics

Under operating conditions, load capacitance for Port 0, ALE/PROG, and PSEN = 100 pF; load capacitance for all other

outputs = 80 pF.

External Program and Data Memory Characteristics

Symbol

Parameter

16 MHz Oscillator

Variable Oscillator

Units

Min

Max

Min

Max

1/t

CLCL

Oscillator Frequency

0

16

MHz

t

LHLL

ALE Pulse Width

85

2t

ns

Address Valid to ALE Low

22

ns

t

LLAX

Address Hold After ALE Low

32

t

ns

t

LLIV

ALE Low to Valid Instruction In

150

4t

ns

ALE Low to PSEN Low

32

ns

t

PLPH

PSEN Pulse Width

142

3t

ns

t

PLIV

PSEN Low to Valid Instruction In

82

3t

ns

Input Instruction Hold After PSEN

00

ns

t

PXIZ

Input Instruction Float After PSEN

37

t

ns

t

PXAV

PSEN to Address Valid

75

t

ns

Address to Valid Instruction In

207

ns

t

PLAZ

PSEN Low to Address Float

10

10

ns

t

RLRH

RD Pulse Width

275

6t

ns

WR Pulse Width

275

ns

t

RLDV

RD Low to Valid Data In

147

5t

ns

t

RHDX

Data Hold After RD

00

ns

Data Float After RD

65

ns

t

LLDV

ALE Low to Valid Data In

350

8t

ns

t

AVDV

Address to Valid Data In

397

9t

ns

ALE Low to RD or WR Low

137

239

ns

t

AVWL

Address to RD or WR Low

122

4t

ns

t

QVWX

Data Valid to WR Transition

13

t

ns

Data Valid to WR High

287

ns

t

WHQX

Data Hold After WR

13

t

ns

t

RLAZ

RD Low to Address Float

0

0

ns

RD or WR High to ALE High

23

103

ns